Here is few steps of conversion process. Hope that you will find it usefull for your experiments)
Step 1 - Making head
Step 2 - Making feets on the base
Step 3 - Legs. I made them higher because nob legs should be larger than ork boy legs
Step 4 - Finalize boots with green stuff
Step 5 - Chose right angle for torso direction
Step 6 - Size compare. Now you see that he visually higher than ork boy
Step 7 - Time for forearm. I chaged pose of hand since my Nob holding road sign with part of concrete on it. And its heavy...
Step 8 - Now it is time to choose apropriate angle for hands
Step 9 - Filling gaps on arms with green stuff
Step 10 - Now I have made a post in his hands and metal list on his right arm
Step - 11 Final one. Put part of tire on Nod shoulder.
Thats all folks)